From: Matthew Gerlach <matthew.gerlach@linux.intel.com>

Add documentation describing the extentions provided by Version
1 of the Device Feature Header (DFHv1).

Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
---
 Documentation/fpga/dfl.rst | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/Documentation/fpga/dfl.rst b/Documentation/fpga/dfl.rst
index 15b670926084..31699b89781e 100644
--- a/Documentation/fpga/dfl.rst
+++ b/Documentation/fpga/dfl.rst
@@ -561,6 +561,30 @@ new DFL feature via UIO direct access, its feature id should be added to the
 driver's id_table.
 
 
+Extending the Device Feature Header - DFHv1
+===========================================
+The current 8 bytes of the Device Feature Header, hereafter referred to as
+to DFHv0, provide very little opportunity for the hardware to describe itself
+to software. Version 1 of the Device Feature Header (DFHv1) is being introduced
+to provide increased flexibility and extensibility to hardware designs using
+Device Feature Lists.  The list below describes some of the goals behind the
+changes in DFHv1:
+
+* Provide a standardized mechanism for features to describe
+  parameters/capabilities to software.
+* Standardize the use of a GUID for all DFHv1 types.
+* Decouple the location of the DFH from the register space of the feature itself.
+
+Modeled after PCI Capabilities, DFHv1 Parameters provide a mechanism to associate
+a list of parameter values to a particular feature.
+
+With DFHv0, not all features types contained a GUID.  DFHv1 makes the GUILD standard
+across all types.
+
+With DFHv0, the register map of a given feature is located immediately following
+the DFHv0 in the memory space.  With DFHv1, the location of the feature register
+map can be specified as an offset to the DFHv1 or as an absolute address.
+
 Open discussion
 ===============
 FME driver exports one ioctl (DFL_FPGA_FME_PORT_PR) for partial reconfiguration
-- 
2.25.1

On 2022-09-06 at 12:04:22 -0700, matthew.gerlach@linux.intel.com wrote:
> From: Matthew Gerlach <matthew.gerlach@linux.intel.com>
> 
> Add documentation describing the extentions provided by Version
> 1 of the Device Feature Header (DFHv1).
> 
> Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
> ---
>  Documentation/fpga/dfl.rst | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/Documentation/fpga/dfl.rst b/Documentation/fpga/dfl.rst
> index 15b670926084..31699b89781e 100644
> --- a/Documentation/fpga/dfl.rst
> +++ b/Documentation/fpga/dfl.rst
> @@ -561,6 +561,30 @@ new DFL feature via UIO direct access, its feature id should be added to the
>  driver's id_table.
>  
>  
> +Extending the Device Feature Header - DFHv1
> +===========================================
> +The current 8 bytes of the Device Feature Header, hereafter referred to as
> +to DFHv0, provide very little opportunity for the hardware to describe itself
> +to software. Version 1 of the Device Feature Header (DFHv1) is being introduced
> +to provide increased flexibility and extensibility to hardware designs using
> +Device Feature Lists.  The list below describes some of the goals behind the
> +changes in DFHv1:
> +
> +* Provide a standardized mechanism for features to describe
> +  parameters/capabilities to software.
> +* Standardize the use of a GUID for all DFHv1 types.
> +* Decouple the location of the DFH from the register space of the feature itself.
> +
> +Modeled after PCI Capabilities, DFHv1 Parameters provide a mechanism to associate
> +a list of parameter values to a particular feature.
> +
> +With DFHv0, not all features types contained a GUID.  DFHv1 makes the GUILD standard
> +across all types.
> +
> +With DFHv0, the register map of a given feature is located immediately following
> +the DFHv0 in the memory space.  With DFHv1, the location of the feature register
> +map can be specified as an offset to the DFHv1 or as an absolute address.

Could you make a table or diagram to describe the data structure layout of DFHv1
extention.

Thanks,
Yilun

> +
>  Open discussion
>  ===============
>  FME driver exports one ioctl (DFL_FPGA_FME_PORT_PR) for partial reconfiguration
> -- 
> 2.25.1
>

On Sun, 11 Sep 2022, Xu Yilun wrote:

> On 2022-09-06 at 12:04:22 -0700, matthew.gerlach@linux.intel.com wrote:
>> From: Matthew Gerlach <matthew.gerlach@linux.intel.com>
>>
>> Add documentation describing the extentions provided by Version
>> 1 of the Device Feature Header (DFHv1).
>>
>> Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
>> ---
>>  Documentation/fpga/dfl.rst | 24 ++++++++++++++++++++++++
>>  1 file changed, 24 insertions(+)
>>
>> diff --git a/Documentation/fpga/dfl.rst b/Documentation/fpga/dfl.rst
>> index 15b670926084..31699b89781e 100644
>> --- a/Documentation/fpga/dfl.rst
>> +++ b/Documentation/fpga/dfl.rst
>> @@ -561,6 +561,30 @@ new DFL feature via UIO direct access, its feature id should be added to the
>>  driver's id_table.
>>
>>
>> +Extending the Device Feature Header - DFHv1
>> +===========================================
>> +The current 8 bytes of the Device Feature Header, hereafter referred to as
>> +to DFHv0, provide very little opportunity for the hardware to describe itself
>> +to software. Version 1 of the Device Feature Header (DFHv1) is being introduced
>> +to provide increased flexibility and extensibility to hardware designs using
>> +Device Feature Lists.  The list below describes some of the goals behind the
>> +changes in DFHv1:
>> +
>> +* Provide a standardized mechanism for features to describe
>> +  parameters/capabilities to software.
>> +* Standardize the use of a GUID for all DFHv1 types.
>> +* Decouple the location of the DFH from the register space of the feature itself.
>> +
>> +Modeled after PCI Capabilities, DFHv1 Parameters provide a mechanism to associate
>> +a list of parameter values to a particular feature.
>> +
>> +With DFHv0, not all features types contained a GUID.  DFHv1 makes the GUILD standard
>> +across all types.
>> +
>> +With DFHv0, the register map of a given feature is located immediately following
>> +the DFHv0 in the memory space.  With DFHv1, the location of the feature register
>> +map can be specified as an offset to the DFHv1 or as an absolute address.
>
> Could you make a table or diagram to describe the data structure layout of DFHv1
> extention.
>
> Thanks,
> Yilun

I was hoping that the actual macro definitions would be sufficient, but I 
will look into making a table.

Matthew Gerlach

>
>> +
>>  Open discussion
>>  ===============
>>  FME driver exports one ioctl (DFL_FPGA_FME_PORT_PR) for partial reconfiguration
>> --
>> 2.25.1
>>
>

On Tue, Sep 06, 2022 at 12:04:22PM -0700, matthew.gerlach@linux.intel.com wrote:
> From: Matthew Gerlach <matthew.gerlach@linux.intel.com>
> 
> Add documentation describing the extentions provided by Version
> 1 of the Device Feature Header (DFHv1).

...

> +With DFHv0, not all features types contained a GUID.  DFHv1 makes the GUILD standard
> +across all types.

GUI_L_D?

-- 
With Best Regards,
Andy Shevchenko

On Tue, 6 Sep 2022, Andy Shevchenko wrote:

> On Tue, Sep 06, 2022 at 12:04:22PM -0700, matthew.gerlach@linux.intel.com wrote:
>> From: Matthew Gerlach <matthew.gerlach@linux.intel.com>
>>
>> Add documentation describing the extentions provided by Version
>> 1 of the Device Feature Header (DFHv1).
>
> ...
>
>> +With DFHv0, not all features types contained a GUID.  DFHv1 makes the GUILD standard
>> +across all types.
>
> GUI_L_D?
>

Thanks for the review and pointing out the typo.

Matthew Gerlach
> -- 
> With Best Regards,
> Andy Shevchenko
>
>
>